- The effects of AZD1775 on the developing human fetus are unknown. For this reason and because molecular inhibitors of Wee1 kinase are known to be teratogenic, women of child-bearing potential (WoCBP) may be included only if acceptable contraception is in place for two weeks before study entry, for the duration of the treatment with the study drug, and for 2 months after the last dose of AZD1775. Male patients who are involved in the study must agree to avoid procreative and unprotected sex (i.e., by using acceptable forms of contraception) and must not donate sperm during the study and for 3 months after the last dose of AZD1775. Where the female partner is pregnant or not using effective birth control, men should be advised to abstain while in the study and for 3 months after the last dose of AZD1775. Female partners, who are of child-bearing potential, of men participating in clinical studies of AZD1775 will also be required to use effective contraceptive measures while their partner is on study drug and for 3 months thereafter. Male patients will be advised to arrange for the freezing of sperm samples prior to the start of the study should they wish to father children while on AZD1775 or during the 3 months after stopping AZD1775.